I figured it out.
Glyphs: definitely the glyphs. Revenge and HS are actually two of the worst threat glyphs. Getting the devastate glyph will give you a massive increase in TPS both single and multiple targets. Blocking is also up there and so is vigilance. The devastate glyph almost doubles the threat your devastate does since it allows you to add the sunder threat modifier twice instead of just once, even when already at 5 stacks. So you do dmg threat + 2x threat modifier. probably not double the threat, but still a massive increase and it is by far our best threat glyph.
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